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Title: Power of one bit of quantum information in quantum metrology
Authors: Cable, Hugo
Gu, Mile
Modi, Kavan
Keywords: Quantum Metrology
Quantum Information
Issue Date: 2016
Source: Cable, H., Gu, M., & Modi, K. (2016). Power of one bit of quantum information in quantum metrology. Physical Review A, 93(4), 040304(R)-. doi:10.1103/PhysRevA.93.040304
Series/Report no.: Physical Review A
Abstract: We present a model of quantum metrology inspired by the computational model known as deterministic quantum computation with one quantum bit (DQC1). Using only one pure qubit together with l fully mixed qubits we obtain measurement precision (defined as root-mean-square error for the parameter being estimated) at the standard quantum limit, which is typically obtained using the same number of uncorrelated qubits in fully pure states. In principle, the standard quantum limit can be exceeded using an additional qubit which adds only a small amount of purity. We show that the discord in the final state vanishes only in the limit of attaining infinite precision for the parameter being estimated.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.93.040304
Rights: © 2016 American Physical Society (APS). This paper was published in Physical Review A and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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